Record changer



June 24, 1952 v. ca. KLEIN ET- AL 2,601,301

' RECORD CHANGER Filed Nov. 2-1, 1945 16 She etSSheet 1 June24, 1952 v.G. KLEIN ET AL 2,601,301

' RECORD CHANGER Filed Nov. 21, 1945 1a Sheets-Sheet 2 FIGB.

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June 24, 1952 v. c. KLEIN in AL 2,601,301

RECORD CHANGER Filed Nov. 21, 1945 1s Sheets-Sheet s FIGA.

E i i June 24, 1952 v. G. KLEIN El AL RECORD CHANGER l6 Sheets-Sheet 4Filed Nov. 21, 1945 June 24, 1952 Filed Nov. 21, 1945 V. G. KLEIN ET ALRECORD CHANGER 16 Sheets-Sheet 5 q \333 M H J 643 349 327 W June 24,1952 V. G. KLEIN ET AL RECORD CHANGER Filed Nov. 21, 1945 FIG IO.

16 Sheets-Sheet 6 June 24, 1952 v. G. KLEIN ETAL 2,601,301

RECORD CHANGER 642 15 f Og I 1 *1 June 24, 1952 v. G. KLEIN ET AL2,601,301

RECORD CHANGER Y Filed Nov. 21, 1945 16 Sheets-Sheet 9 June 24, 1952 v.G. KLEIN ET AL RECORD CHANGER 16 Sheets-Sheet. 10

Filed Nov. 21, 1945 June 24, 1952 v. G. KLEIN ET AL 2,601,301

RECORD CHANGER Filed Nov. 21, 1945 16 Sheets-Sheet 11 June 24, 1952 v.G. KLEIN El AL 2,601,301

RECORD CHANGER Filed Nov. 21, 1945 1a Sheets-Sheet 12 FIG.30.

June 24, 1952 v. G. KLEIN ET AL RECORD CHANGER l6 Sheets-Sheet 15 FiledNov. 21, 1945 FIG-4!. 53/

June 24, 1952 v. G. KLEIN ET AL RECORD CHANGER l6 Sheets-Sheet 14 FiledNov. 21, 1945 ZED-5k mom 12mm Rm mnw rmmm b mg .53 2 mz.Illllll'lvlllll! MAN llllll ll fi Mm QR I PIME..

June 24, 1952 v. G. KLEIN ET AL 2,601,301

RECORD CHANGER Filed Nov. 21, 1945 16 Sheets-Sheet 15 v =2 F zmamm Emfimzonr ENE uzok un 4, 1952 v. G. KLEIN El AL 2,601,301

RECORD CHANGER Filed NOV. 21, 1945 16 Sheets-Sheet 16 Patented June 24,1952 RECORD CHANGER Victor G. Klein, St. Louis, and Carl H. Mueller,

Ferguson, Mo., assignors to Lincoln Engineering Company, St. Louis, Mo.,a corporation of Missouri Application November 21, 1945, Serial N 0.629,932

Claims. 1

This invention relates to record changers, and with regard to certainmore specific features, to a phonograph disc record changer.

Among the several objects of the invention may be noted the provision ofa quiet, relatively compact and inexpensive machine for sequentiallychanging records in connection with a phonograph; the provision of arecord changer of the class described which without special ad justmentswill sequentially play records of widely different sizes; the provisionof a record changer of the class described which will play in sequenceboth sides of each record in series according to the so-called manualrecording wherein a musical sequence is recorded serially alternately onthe fronts and backs of successive records, and which will also playso-called drop recordings, wherein a musical sequence is on given facesof successive records and then in sequence on their reverse faces; theprovision of a record changer of the class described which can be set torepeat the playing of any desired record face and then if desiredcontinue a sequence; the provision of a changer of the class describedwhich handles records speedily but gently and without danger ofbreakage; the provision of a changer of the class described which issubstantially foolproof in operation, requiring only the simplestoperating procedure; the provision of a changer of the class describedin which factory adjustments for perfect operation may readily be madeand held; and the provision of a device of the class described which iseconomical to manufacture in quantity and which is easy to service andmaintain. Other objects will be in part obvious and in part pointed outhereinafter.

The invention accordingly comprises the elements and combinations ofelements, features of construction, and arrangements of parts which willbe exemplified in the structures hereinafter described, and the scope ofthe application of which will be indicated in the following claims.

In the accompanying drawings, in which one of various possibleembodiments of the invention is illustrated:

Fig. 1 is a top plan view of the apparatus shown open;

Fig. 2 is a front elevation shown closed;

Fig. 3 is a rear elevation of mechanical structure removed from a case,being taken on line 3-3 of Fig. l, certain parts being broken away forclarity;

Fig. 4 is a left-handelevation of Fig. 3 being taken on line 4 l of Fig.1, certain parts being broken away;

Fig. 5 is a horizontal section taken on line 5-5 of Fig. 2;

Fig. 6 is a horizontal section taken on line 6--6 of Fig. 3 but rotatedin the plane of paper, parts being broken away;

Fig. 7 is a vertical section taken on line 1-? of Fig. 5, showing a tonearm in a raised safe position;

Fig. 8 is a plan view of Fig. '7;

Fig. 9 is a view similar to Fig. 7 with the tone arm in a depressedposition to play 2. record;

Fig. 10 is a view similar to Fig. 7 with the tone arm in a position foradvancing to or receding from a record;

Fig. 11 is a plan view similar to Fig. 8, showing the tone arm in aposition starting to play a record;

Fig. 12 is a view similar to Fig. 11 showing the tone arm in positionnear the end of the playing of a record;

Fig. 13 is a plan view of the tone arm showing it in position for finalautomatic stopping of the machine after a playing sequence;

Fig. 14 is a front elevation of a transfer arm mechanism shown in apreparatory position over a record stack;

Fig. 15 is a view similar to Fig. 14 showing the transfer arm in atransfer position over a turntable;

Fig. 16 is a view similar to Fig. 14 but showing the transfer arm in aposition wherein a record is being applied to the turntable;

Fig. 17 is an enlarged vertical section taken on line Il-l'i of Fig. 5,showing vacuum grip means at the end of the transfer arm Fig. 18 is avertical section taken on line lit-i3 of Fig. 5, showing a turntablevacuum grip and turning mechanism;

Fig. 19 is an enlarged vertical section taken on line l9|9 of Fig. 6,showing one pneumatic control cam mechanism for controlling ordinaryoperation;

Fig. 20 is a right side view of Fig. 19;

Fig. 21 is a vertical section taken on line 2 l-2l of Fig. 6, showing asecond cam mechanism for controlling repeating operations;

Fig. 22 is a detail section taken on line 23-23 of Fig. 19, showing atypical cam-operated control valve;

Figs. 23 to 34 are diagrammatic detail sections taken on lines 23-23 to34-34 respectively on led to confusion and even record breakage. presentinvention overcomes the above difficul- 3 Fig. 19 and. showing instarting positions certain operating cams;

Figs. to 38 are diagrammatic detail sections taken on lines 35--35 to38-43 respectivel of Fig. 21, showing additional operating cams;

Fig. 39 is an enlarged detail section of a reject control valve; v

Fig. 40 is an enlarged detail section of an automatic sequence valve;

Fig. 41 is an enlarged longitudinal section of a repeat controlmechanism;

Fig. 42 is a broken-away view, similar to Fig. 41, but showing analternative-position of parts;

Fig. 43 is an enlarged longitudinal section of a control valve for droprecordings;

Fig. 44 is an enlarged detail sectional view taken on line 44-44 of Fig.6, showing a pump bellows;

Fig. 45 is an enlargedlongitudinal detail section taken on line 45 i5 ofFig. 6, showing a regulator bellows;

Fig. 46 is an enlarged detail section taken on line 45-46 of Fig. 3,showing a retarding valve;

Fig. 47 isv an enlarged vertical section taken online 4'l41 of Fig. 5;

Fig. 48 is a detail section of a record receiver drawer interlockcontrol;

Fig. 49 is a schematic layout of the invention for manual recordingoperation, the light full lines showing inoperative pipes for thespecified operation, the solid full lines showing pipes which arepermanently evacuated during this operation, and the dotted linesshowing controllably evacuated lines;

Fig. 50 is a view similar to Fig. 49 for repeating operation;

Fig. 51 is an enlarged horizontal section taken on line 5 [-51 of Fig.3; and,

Fig. 52 is a wiring diagram showing an additional safety feature.

Similar reference characters indicate corresponding parts throughout theseveral views of the drawings. I

The record changers heretofore in use have been mechanically'complex,costly and hard on records, particularly in those forms of the changerswherein attempt was made to accommodate records of both the so-calledmanual recording and drop reoording types. In addition, the formermachines required a special operating technique on the part of the userwhich often The ties and may be carried out by a much simpler and lesscostly machine and one which may be built with more dimensionaltolerances.

Referring now more particularly to Figs. 1 and 2, there is shown atnumeral l a console type of case having a central section 3 above whichis hinged an openable lid 5. The lid is shown open in Fig. l and closedin Fig. 2. At the left is a record storage compartment 1 and at theright a compartment 9 for the usual electrical sound producing andamplifying system, the details of which form no part of the presentinvention. The section 3 has a bottom support H for supporting therecord changer parts. At the top is a table I3 for supporting a stack ofrecords. A hole 12 at the right in the table l3 (Figs. 1 and 5) islocated above a record receiving drawer 631.

Referring to Figs. 3, 4 and 5, the assembly of parts within thecompartment 3 is shown. This assembly consists of a frame I5 on a bed H.on the bed H is a vacuum pump indicated in general at l9. This pump hasa driving pulley 2| driven by a belt 23 from a motor 25. The main pumpshaft 2! (driven from said pulley 2 I) drives an eccentrically locatedcrank pin 29 from which extend four connecting rods 3! to four clevises33 respectively. The clevises 33 are respectively attached to rockers 35of a set of four vacuum bellows 31. A detail of 'each bellows is shownin Fig. 44. The rocker 35 of each bellows is pivoted at 39 to astationary block 4!, the usual air-tight folded bellows material 53being attached between the rocker 35 and the block 4|. An exhaust valve45 allows outward but not inward flow of air, as indicated by thearrows. In the block 4| is a suction valve 47 allowing inward but notoutward flow of air. Thus oscillation of the rocker 35 upon pivot 39tends to evacuate the space between it and the block 4! and any spacesconnected with the bellows through the valve 47.

Four-bellows'are shown for the pump, but it will be'understoodthat anysuitable number designed to give the desired vacuum may be used. Also,other types of vacuum pumps may be employed.

Each suction valve 41 is connected through a tube 49 with a suctionmanifold'5l (see Figs. 4, 6 and 49). As will be shown, various tubesextend from the'manifold 5| for applying vacuum to various points. Themanifold 5| is connected through a tube 53 with asuction regulator device 55 shown in Figs. 3, 6, 45 and 49. In detail this suction regulatordevice (Fig. 45) consists of a fixed block 51 to which is pivoted at 59a rocker 6|. Rocker 6| and bed 51 are also connected by means ofair-tight and folded bellows material 63. Rocker BI is biased from theblock 51 by means of an expansion spring 65. The movable end 61 of thespring 65 is carried in a cup 69 having an adjustable bottom Hcontrolled from a threaded stem '13 which can be locked in anyadjustedposition by a nut 15. Vacuum applied between the block 51 and rocker 61tends to draw the latter tothe former. In order to break the vacuum at agiven pressure value, the rocker Bl carries a relief valve showngenerally at 11. This valve has an inlet port 19 traversed by a valvestem 8| tapered at 83. This stem is backed by a compression spring 85.When the rocker 6| reaches a predetermined point in its travel towardblock 51, the end 8'! of the stem 81 touches the block. This forces thetaper'83 through the port 19 to gradually break the vacuum. This stopsfurther advance of the rocker GI and tends meet a predetermined vacuumvalue. The valve assembly I! includes a case 89 in which are inletports9| covered internally by means of a sound muffler and air filter block93composed of felt or the like. By means of the above described parts, apredetermined value of vacuum may be maintained in the manifold 5|and'the lines connected therewith.

The motor 25 in addition to driving the pump [9 also drives a verticalshaft 95 'throughaworm gear speed reduction box 9'! (see Figs. 4,6 and4'7) The motor 25 is connected with the box 9'! through a drive 99. Thisdrive 99 also passes through a worm gear reduction box lfll. By means ofsaid box lfll the motor drives a countershaft I03 upon which are pulleysI05and Iii-I. Pulley I05, through a belt [09, drives a pulley Ill. Thepulley Ill drives a cam shaft H3 througha gear reduction train H5 andvacuumoper'ated clutchshownin'general at H5 inFi'gs.

6, 19 and 29. Pulley I91, through a belt II5, drives a pulley 1. Thispulley II1 (Fig. 3) drives a cam shaft II9 through a gear reductiontrain I2I and vacuum-operated clutch I22 shown in general in Fig. 21. Aswill appear, cams on the cam shafts H3 and H9 serve to control valvesfor applying suction from the manifold to various points of usethroughout the machine.

Returning to the vertical shaft 95, it is for the purpose of driving aninvertible turntable shown more particularly in Figs. 3, 4, 5, 13, 18and 47. This turntable is an important feature of the invention andincludes an invertible cradle beam I23. This cradle beam I23 is in theform of a hollow shaft I25 depending, by means of arms I21, fromcollinear bearings I29 in the frame I5. At the central portion of thehollow shaft I25 is a small gear box I3I (Fig. 18) in which is a rotaryhollow shaft I33 connected through a packing gland I35 with a vacuumtube 415. The hollow shaft I33 is rotated by means of a bevel gearreduction unit I39 driven from a shaft I4I located in the hollow shaftI25. The rotary hollow shaft I33 has attached to it for rotation a smallturntable I43. The upper part of the turntable carries a resilientmember I45 having concentric flexible circular lips I41 for supportingand gripping the central portion of a record 249 (see Fig. 18). MemberI45 may be referred to as a suction pad. It has openings I49 thereinconnected by means of ports I5I with the hollow shaft I33. Thus if arecord rests upon the pad I45 and suction is applied to ports I49 fromthe tube 415, the record will be gripped and held in place against theflexible lips I41. This will be true even if the turntable I43 isinverted and even though the grip surface of the record is slightlyuneven, warped or rough. Even some leakage past the lips I4! will notbreak the vacuum which is continuously being generated while a record isbeing held. The turntable I43 also includes a guide pin I53 extendingthrough the pad I45 and above the lips I41 for centering the record 249by means of the usual center hole formed in all standard records.

The drive shaft I4I, as shown in Figs. 3, 5, 15, 16 and 47, passes outfrom the end of the hollow shaft I25 where it is provided with afriction drive cone I55. Clearly, rotation in either direction of thefriction cone I55 will rotate the table I43 through the shaft I4I, bevelgear train I39 and rotary shaft I33. Since the center line of the shaftI4! is on the center line of the hollow shaft I25, this shaft I4I may bemade to revolve about the axis of the collinear bearings I29. This isdone by revolving the cradle on its bearings I29. In doing so, thefriction cone I55 may be brought from its downward position shown inFigs. 3, 4 and 5 to its upward position shown in Fig. 47. Such movementobviously inverts the turntable I43 180 from the Fig. 18 position, forexample, to the Fig. 47 position. The collinear axes of bearings I29 arearranged to pass through the central plane of a record carried on thetable I43. Hence both playing surfaces of the record come into positionnear a common horizontal plane when the record is in either 180horizontal position (compare Figs. 16 or 18 with Fig. 47).

When the cradle I23 is in its depending position shown in Figs. 3, 4, 5,16 and 18, for example, the bevel cone I55 is in friction contact with alower bevel cone I51, splined to the shaft 95. The bevel cone I51 isbacked by a spring I59,

reacting from a fixed collar IBI on the vertical shaft 95. Thus when thecradle I23 is down (depending) a friction drive is effected from shaftthrough cones I51, I55, shaft I4I, bevel 3 gears I39 and hollow shaftI33 to the turntable I43. Thus the turntable when upright as shown inFig. 18 is rotated in a given direction.

On the other hand, if the turntable is inverted around thecollinearbearings I29 into an upright position such as shown in Fig. 47,the bevel cone I55 will be placed in frictional engagement with a thirdand upper bevel cone I53, also splined to the shaft 95. This cone I63 isbacked by compression spring I55 reacting from a fixed collar I51 onsaid shaft 95. Thus in the inverted position of the cradle I23 the theninverted turntable I43 may be driven from shaft 95 through the bevelcones I53, I55, shaft I4I, bevel gears I39, and shaft I33. Although,when the cradle is inverted, the rotation of the turntable I43 reverseswith respect to the cradle I23, the rotation of the turntable whenviewed along an axis from either the top or the bottom of the machineremains in the same direction, that is, with respect to the frame I5.

At numeral I59 is shown a counterweight for the cradle I23 which atleast partially counterbalances it around the axis of the bearings I29.Since the friction cone I55 is outside of the side of the main frame I5(Fig. 5) a passage |I1I is provided to accommodate the swing of theextending shaft I4I, strength being provided by brace I13. The brace I13is also used to support the upper end of the shaft 95 in an attachedbearing bracket I14 (Figs. 3, 4 and 47). The vacuum tube 415 is flexibleand accommodates to the 180 swing of the shaft I25.

One of the pintles I15 of the cradle I23 at one bearing I29 carries apinion I11 which is driven from a sector gear I19, the latter having arotary support I8I on the frame I5 (Fig. 3). The sector gear I19 has anarm I83 to which is pinned a connecting rod I35 reaching to a broadclevis I81 (Figs. 3, 5, 14 and 16). This clevis I91 is pivoted at I99 tothe central rocker I9I of a double bellows assembly I93. This bellowsassembly has two fixed blocks I95 and I91. Bellows material I99 connectsblock I95 with the rocker I9I. A second bellows 29I connects block I91with the rocker I9I. Block I 95 is fixed to the frame I5 by means of abracket 293, and block I91 is held substantially stationary by means ofpinned tie bars 295, although slight up and down movement is possible topermit I9! to rock. A vacuum connection through block I95 is shown at291. This is connected to tube 5I5. A vacuum connection through blockI91 is shown at 299. This is connected to tube MI. The position of theconnecting rod I35 is deter mined by the relative pressures on oppositesides of the rocker I9I. These are determined by the vacuums atconnections 291 and 299.

The depending or inverted positions of the turntable cradle are thusunder control of these connections 291 and 209. The stroke of the rockerI9I and of the mechanism I95, I93, I19 and I11 is such as to bring aboutsaid inversion of the cradle and turntable through 180. Adjustable stops2II (Figs. 3, 5 and 47) precisely determine the positions of the cradlefor accurate leveling of the turntable in either its upright or invertedpositions. One of the supporting arms I21 for the cradle I23 engages thestops for the purpose. Thus the records are leveled in either of theirhorizontal positions.

In order that the cradle I23 maynot be stopped too. suddenly by thelimiting stops. 211, each vacuum connection-251 and we includes. aretarder valve such as illustrated in Fig. 46.; Each valve consists in avalve. stem 213, havinga head 2:55 which is movable toward either of.two seats: 2%? or 2i9. The valve is normally biased by means of a spring221. toward its pcsitionadjtacent seat 2H. The valvesprin'g ldoes notprevent. the generation of reduced pressure in the bellows. However, atthe end of the. stroke of the rocker Edi. the head 223 of the adjacentvalve iscontacted by the rocker, thus'pushing the'valvev toward the seat2 l9 and throttling the suction outlet. Hence advance of the rocker isretarded. Consequently, the advance. movement of. the cradle toward theendsv of its movements toward. the" stops 2! l. is retarded andpreventsa jolt on the record.

Carried on the frame l at 225 is a; vertical bearing (see Figs. 3,5,14,15, 16' and 17:), which rotatably supports a. vertical arm 221 bentto form a reach rod 229. At the end of 229 is a vertical bearing, 23!.The bearing 231' carries a. plunger 233 at. the lower end of which is asuction cup 235'. In cup 235 is a suction pad 231 made of suitableresilient material for the purpose. This pad also has concentricresilient circular lips 239 for contacting the upper surfaces ofsuccessive records. to be taken. from a stack. on table 13, such asindicated at 241 in Fig. 3. Details of the suction cupare in Fig. 17.

The end of the plunger 233 is hollow, as indicated at 243, and. has a,nipple connection 245 with a flexible suction line 419.. Thehollowportion 243 is in communication through ports 2-4.1 with passages 249.through the pad. 237. Thus if. the suction cup 235 be. applied to theupper surface of a record and a vacuum is applied. to the nipple 245from line 419,.arecordimaybe gripped and picked up. The" advantages ofthis type of suction grip have been described above inv connection withthe suction grip I45 for the turntable I43 and need no repetition.

The plunger 233 is reciprocated by means of an arm 2.51 which is pivotedto thevertical arm 22'? at 2.53.. The outer end of the arm 25! is.articulated' to the plunger 233. by means of a con. necting link 255.Thus if the arm 25!- is raised. or lowered, the suction cup 235 likewisewill. be raised or lowered.

The arm. 25! is-raised and lowered by means of a connecting rod 251pivoted at 259 to the arm 25E (see Figs. 3, 4,.14, 1'5, 16 and.51.).This rod. 257 at the lower end is pivoted to a rocker 26I (see pivot293).. The rocker 2H forms part. of a suction bellows indexed generallyas 255. This bellows has a block: 261 (stationary with respect: torocker 26!) which is attached to a rotary bracket 25 9. Bracket 2-69 isattached to the lower end of the rod 221 and swings therewith. A hole.258 in the bracket. accommodates passage. of the connecting rod 251.vThis bellows is also provided with bellows material 2 and:v has asuction inlet at 213 for vacuum line 48.1.. By applying a vacuum to thebellows throughline 431' the. rocker 25l maybe raised. from the. Fig. 3position to the Fig. 14 position, thus raising. the. plunger 233 and.the suction cup 235. Thus an attached recordmay bev lifted.

The purpose of the bent arm 221, 229- is, after the suction cup. 235 hasbeen. raised. with a suspended record, tov swing. from. a position. overthe:- stack of records 2. to a. position over the turntable I43. Toaccomplish this. .rotation,.an.ofi:- center pivot 215 is placed on thelower bracket 259. Connected at this pivot 2151s a connecting rod 21.!which. reaches to a clevis:2.19 attached to the. rocker 28:!" of .a.bellows shown generally at 283.. This bellowsihasi a. fixed block .285con,- nected. with the rocker 2'8l' by means-ofv bellows material .281.A suction inletfor this bellows'is.

shown at 289' for. suction line-48,3. A second and smaller bellows isshown at 29] connected. with the bellows 283'. This smaller bellows hasa substantially fixed block 29.3" held. in position-by bars 295. Itsrocker 291 is attached to the rocker 2st of the larger bellows 283. Someplay in-block 293' allows full rocking of. blocks 2-81 'and- 291. Therocker 281 is, pivoted toith'eblock- 285 at hinge 299. The rocker 291(movable with the rocker 281') is pivoted to the, block 293 at hinge 39LAny slight upward movement requiredof the block 293 by theqhingingaction at 299 and 30! is; accommodated by'slig'h-t swing of the bars295.. The bellows 291 has a suction inlet 393 on itsbloc'k'29:3,forvacuum line 593: Essentially, the organization of thebellows 283 and 291 comprises a. differential pressure bellows'in whichthe larger area of the rocker 281' exposed to pressure is designed togive a greater force than the smaller area of the rocker 291 whenexposed to the same pressure, whereby the action of the bellows 283 willovercome action of the bellows-291 under equal pressure conditions. Aswill appear later, the action of the small bellows 29! is to reopen thelarge bellows 283- after vacuum in the latter hasbeen broken. A springor a weight might also be used for the purpose.

In order that the action of the rocker 2m in swinging the arm 229 maybe: limited, the fixed bearing 2251s provided with two angularly re--latedadjustable stops 305 cooperating with an extension 397 (see Figs.5, 14, 15-, 16 and 5L).

This is. in the form of a' rib extending upward from the median line ofthe bracket 259 to. a

height sufiicient to contact the opposite stops 30-5 at each desired endof the travel of arms 25] and 229.

At numeral 3% (Figs; 1 3-5 and 7-13.) is shown a tone arm pivotallymounted at 3H on a post 3i3'from which extend vertically collinear.bearings 3 l5; These bearings-are carried in. collinear sockets 3 I I ina bracket Iii-9- clamped to theframe i5.. The sockets 3 ll are on apractically, but not exactly, vertical axis, the axisbeingtilted'enoug-h so that gravity will bias the-tone arm to driftfrom. aposition such as shown in Fig. 13 to a. return position such asshown in Fig- 8; The tone armper se is of ordinaryconstruction, carryinga needle pickup, crystal, and suitable wiring. for connection into thecircuit of the apparatus in cabinet 9. Details of these connections are.not

necessary since they are. made according. toknown.

sound pickup. systems. The tone. arm. needle is shown at 32 1..

In order toraise andlower the tone arm around the pivot. 3H we. provide.at the. lower end of thepost 3 1 31a bracket-3'23. which support-eablock.

Pivotedtothe rocker at -33] is-a clevis 333- Onthe upper end of.the-clevis is a'tu-be. 3 I in whichslides a rod 3 23, the latter beinglimited in its movement with respect to the tube 341 by an adjustablecollar 355: The upper end oftherod 343- is pivoted at 3M1- to the tonearm. The parts 344 343 and 3 35 provide a lost-motion connectionbetweenthe tone arm 3% and the rocker 329. Thus

